An Aloe Vera plant can be poisonous if the latex is ingested. The latex in it can cause purging of the large intestine. Aloe plants can be beneficial in treating burns and other minor dermatitis. If the aloe plant is going to be used make sure you cut away the skin and inner layer that produces yellow juice. Only use the gel.

Weeds: Weeds are not nearly the problem with a hanging tomato planter. Since you have a small soil base, and it's contained above ground, there is little need for weeding these plants.

There's about 6 or 8 disaster scenarios that I can think of that seem likely to happen at some time. Most of them seem unlikely to happen in my lifetime. But you never know. Isn't it prudent to be prepared, at least to some extent, in the event the normal food supply is interrupted? Examples of disasters that seem likely to happen are an asteroid hitting the earth, a massive nuclear war, a global epidemic, and the failure of one or two major crops such as corn and wheat due to a widespread disease or climate change.